Commands tagged bash (821)

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Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Notify me when users log in
Notifyme is a program that listen in background for users login, and report on login and logout. Users can be specified from a list or in a ~/notify.rc file. -C options force to display messages on the center of the screen.See man notifyme for more details. Part of notifyme package, tested on Debian.

Search some text from all files inside a directory

Floating point power p of x
One pipe less.

Count lines using wc.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Auto-log commands
A quick alias I use right before logging into a server so that I have a log of the transactions as well as the ability to re-connect from another computer. Useful for when your boss says "what commands did you run again on that server?" and you had already closed the terminal ;) I wrapped it in a script now, with more features, but this is the heart of it. Never leave home without it.

Swap a file or dir with quick resotre
This lets you replace a file or directory and quickly revert if something goes wrong. For example, the current version of a website's files are in public_html. Put a new version of the site in public_html~ and execute the command. The names are swapped. If anything goes wrong, execute it again (up arrow or !!).

Copy a directory recursively without data/files

Find files with the same names in several directories.
cat file1 file2 file3|sort|uniq -d finds the same lines in several files, especially in files with lists of files.


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